CN117997140A - Collecting system, voltage control method, device, medium and collecting method - Google Patents
Collecting system, voltage control method, device, medium and collecting method Download PDFInfo
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- CN117997140A CN117997140A CN202410407395.0A CN202410407395A CN117997140A CN 117997140 A CN117997140 A CN 117997140A CN 202410407395 A CN202410407395 A CN 202410407395A CN 117997140 A CN117997140 A CN 117997140A
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- 238000004590 computer program Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011176 pooling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
本发明属于海上风电直流送出技术领域，现有HVDC汇集系统未考虑扩展特性的不足，本发明采用如下技术方案：HVDC汇集系统，包括：多个直流端口电压不同的单极型单极型汇集系统，单极型单极型汇集系统包括电压源换流器，电压源换流器将三相交流电转换为直流电；多个直流电感器，直流电感器的数量与单极型单极型汇集系统的数量相同；串联的多个子模块，子模块包括高压直流电容、半导体开关器件和二极管；其中，各单极型单极型汇集系统的直流端口通过相应的直流电感器连接到不同的子模块。本发明的HVDC汇集系统，具有良好的扩展性，各电压等级端口的建设可以分批次进行，工程实施难度低；整体控制简单、高效。
The present invention belongs to the technical field of offshore wind power direct current transmission. The existing HVDC collection system does not consider the shortcomings of expansion characteristics. The present invention adopts the following technical scheme: HVDC collection system, including: multiple monopolar monopolar collection systems with different DC port voltages, the monopolar monopolar collection system includes a voltage source converter, and the voltage source converter converts three-phase AC power into DC power; multiple DC inductors, the number of DC inductors is the same as the number of monopolar monopolar collection systems; multiple submodules connected in series, the submodules include high-voltage DC capacitors, semiconductor switching devices and diodes; wherein the DC ports of each monopolar monopolar collection system are connected to different submodules through corresponding DC inductors. The HVDC collection system of the present invention has good scalability, the construction of ports of each voltage level can be carried out in batches, and the difficulty of engineering implementation is low; the overall control is simple and efficient.
Description
Technical Field
The invention belongs to the technical field of offshore wind power direct current transmission, and particularly relates to an HVDC collecting system, a voltage control method, equipment, a medium and an HVDC collecting method.
Background
With the construction of a novel power system taking new energy as a main body, a large-scale alternating current and direct current series-parallel connection condition of a power grid in China occurs. In particular to coastal areas, as alternating current power grids such as tidal flat photovoltaics and alternating current loads exist and direct current delivery systems such as offshore wind power and offshore hydrogen production exist, how to realize comprehensive and effective collection of various energy sources in the areas becomes an important research direction of a new generation super collection station.
The construction of the multiport HVDC (High Voltage Direct Current, high-voltage direct-current transmission) pooling system is a power circuit foundation for realizing the super pooling station of the new generation and is a core technology for realizing the super pooling station of the new generation. As the name suggests, multiport HVDC collection systems are mainly used for collecting a plurality of HVDCs. The topology of a multiport HVDC sink system should have flexible and scalable properties in view of the fast evolving nature of the grid.
However, current offshore wind power is usually transported end-to-end, and after the system design is completed, it is difficult to increase voltage or other offshore wind power with different capacities at a later stage. In addition, the current research is mainly focused on the sending end collecting output of the far-sea wind power, and the research on the receiving end direct current collecting system of the far-sea wind power plant involves less, and the research on the expandable characteristic of the receiving end collecting system is still blank.
Disclosure of Invention
Aiming at the defect that the existing HVDC collecting system does not consider the expansion characteristic, the invention provides an HVDC collecting system which realizes flexible collection of a plurality of HVDC, and is particularly suitable for collection of a plurality of offshore wind power. The invention also provides a voltage control method, a computer device, a computer readable storage medium and an HVDC collecting method of the HVDC collecting system.
In order to achieve the above purpose, the invention adopts the following technical scheme: an HVDC collection system comprising:
The unipolar collecting system comprises a voltage source converter, wherein the voltage source converter converts three-phase alternating current into direct current;
A plurality of direct current inductors, the number of which is the same as that of the monopole type collecting system;
The system comprises a plurality of submodules connected in series, wherein each submodule comprises a high-voltage direct-current capacitor, a semiconductor switching device and a diode;
wherein one pole of the dc port of each unipolar collecting system is grounded and the other pole is connected to a different sub-module via a respective dc inductor.
The HVDC collecting system comprises a plurality of unipolar collecting systems, a plurality of direct current inductors and a plurality of submodules, wherein the unipolar collecting systems comprise one or a plurality of voltage source converters, a plurality of alternating current ports and direct current ports can be flexibly arranged, and the system is suitable for collecting multiport HVDC and has good expansibility; only the highest voltage level and the lowest voltage level need to be designed in the initial stage of the design of the whole system, the subsequent construction of each port can be carried out in batches, the expansion is carried out continuously, and the utilization rate and the comprehensive economic benefit of the whole system are fully improved; the realization of different voltage levels of the whole system depends on the submodule, the submodule can adopt a cascading half-bridge structure, and the cascading half-bridge structure is an extremely mature engineering scheme in the field of electrical engineering at present, so that the engineering implementation difficulty is low; the whole system is simple and efficient to control, and a complex control algorithm is not needed.
As an improvement, the unipolar collecting system comprises a plurality of voltage source converters with parallel alternating current ports, and the direct current ports of the voltage source converters are connected to the direct current inductor after being collected.
As an improvement, the voltage source converter is a two-level voltage source converter, a three-level voltage source converter or a modularized multi-level converter; the sub-modules are half-bridge sub-modules.
The voltage control method of the HVDC collection system, applied to the HVDC collection system described above,
For any two monopole type collecting systems x and y, the direct current voltage of the monopole type collecting system with lower voltage is set as U dcx, and the number of connected submodules is N x; the direct current voltage of the monopole type collecting system with higher voltage is U dcy, and the number of connected submodules is N y;
The bypass duty cycle D of all sub-modules between two ports in each period T satisfies:
(1)
from formula (1):
(2)
Wherein Vc is the nominal value of the capacitor voltage in each half-bridge sub-module;
The capacitor voltage balance of each sub-module is ensured through sequencing voltage-sharing control, and the method can be as follows:
(3)
based on the formulas (2) and (3), D can be rewritten as:
(4)
Meanwhile, if the HVDC sink system 0 is used as a reference, then:
(5)；
The direct current port voltage of the unipolar type collecting system 0 with the lowest direct current voltage is set as U dc0, the direct current port voltage of the unipolar type collecting system m with the highest direct current voltage is set as U dcm, the unipolar type collecting system comprises a plurality of voltage source converters with alternating current ports connected in parallel, and active control of external direct current port voltages U dc0 and U dcm is realized through coordinated control of each voltage source converter in the unipolar type collecting system.
The computer device comprises a processor and a storage medium, wherein a computer program is stored in the storage medium, and the computer program realizes the voltage control method of the HVDC collecting system when being executed by the processor.
A computer readable storage medium having stored thereon a computer program which, when executed, implements the aforementioned method of controlling the voltage of an HVDC sink system.
An HVDC collection method comprising:
Step S1, determining a lowest direct current voltage U dc0 and a highest direct current voltage U dcm;
S2, determining relevant parameters of each monopole type collecting system, each direct current inductor and each submodule, and determining the number of the submodules;
and S3, constructing a monopole type collection system, a direct current inductor and a submodule of the direct current voltage with the required magnitude in batches, and finally expanding the monopole type collection system into the HVDC collection system.
Drawings
Fig. 1 is a topology diagram of an HVDC sink system of an embodiment of the present invention.
Fig. 2 is a logic diagram of a voltage control method of the HVDC sink system of an embodiment of the present invention.
Fig. 3 is a voltage control schematic diagram of a direct current port cascaded half-bridge structure of an HVDC sink system in accordance with an embodiment of the present invention.
Detailed Description
The following description of the technical solutions of the inventive embodiments of the present invention is provided only for the preferred embodiments of the invention, but not all. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making any inventive effort fall within the scope of protection created by the present invention.
Referring to fig. 1, an HVDC sink system of an embodiment of the present invention comprises:
The unipolar collecting system comprises a voltage source converter, wherein the voltage source converter converts three-phase alternating current into direct current;
A plurality of direct current inductors, the number of which is the same as that of the monopole type collecting system;
The system comprises a plurality of submodules connected in series, wherein each submodule comprises a high-voltage direct-current capacitor, a semiconductor switching device and a diode;
wherein one pole of the dc port of each unipolar collecting system is grounded and the other pole is connected to a different sub-module via a respective dc inductor.
In this embodiment, the unipolar type collecting system includes a plurality of voltage source converters with ac ports connected in parallel, and the dc ports of each voltage source converter are connected to the dc inductor after being collected, that is, the unipolar type collecting system is a unipolar type multiport HVDC collecting system. The HVDC collection system comprises a plurality of polar multi-port HVDC collection systems, a plurality of direct current inductors and a plurality of sub-modules. In this embodiment, there are m+1 number of monopolar multiport HVDC sink systems.
In this embodiment, the plurality of voltage source converters may be connected to a plurality of different offshore wind power generation sources, and may also be connected to different areas of the same offshore wind farm. By adopting the connection mode, on one hand, the offshore wind farm which is built in different periods is conveniently connected to a direct current bus (direct current induction station) of a unipolar collecting system through a plurality of voltage source converters; on the other hand, considering that the open sea wind power plant has larger capacity, the adoption of one voltage source collector can bring about difficulty in construction, so that the multi-converter parallel connection mode is more beneficial to the construction of the open sea wind power plant. The operation modes of the internal converters are various, which shows that each unipolar collecting system has strong expandability.
In this embodiment, the voltage source converter (Voltage Source Converter, VSC) is a two-level voltage source converter, a three-level voltage source converter, or a modular multilevel converter (Modular Multilevel Converter, MMC). Specific constructions of a two-level voltage source converter, a three-level voltage source converter or a modular multilevel converter may be seen in the prior art.
In this embodiment, the sub-modules are Half-bridge sub-modules (Half-Bridge Submodule, HBSM). The specific structure of the half-bridge sub-module can be seen in fig. 1 and the prior art, and will not be described herein.
The HVDC collecting system comprises a plurality of unipolar collecting systems, a plurality of direct current inductors and a plurality of submodules, wherein the unipolar collecting systems comprise one or a plurality of voltage source converters, a plurality of alternating current ports and direct current ports can be flexibly arranged, and the system is suitable for collecting multi-port HVDC and has good expansibility; only the highest voltage level and the lowest voltage level are required to be designed in the initial stage of the design of the whole system, the construction of the subsequent ports can be carried out in batches, the expansion is carried out continuously, and the utilization rate and the comprehensive economic benefit of the whole system are fully improved; the realization of different voltage levels of the whole system depends on sub-modules, the sub-modules adopt half-bridge sub-modules, the cascade half-bridge structure of the half-bridge sub-modules (cascade belongs to engineering empirical expression, the currents of ports of different sub-modules are equal, the total output voltage of a bridge arm is equal to the sum of the voltages of ports of all the sub-modules, the characteristic accords with the definition of series connection, namely, all the sub-modules are actually connected in series) is an extremely mature engineering scheme in the electric engineering field at present, and the engineering implementation difficulty is low; the whole control of the system is simple, and a complex control algorithm is not needed.
Referring to fig. 2 and 3, a voltage control method of the HVDC sink system, applied to the HVDC sink system of fig. 1,
Referring to fig. 2, let the dc port voltage of the unipolar type collecting system 0 with the lowest dc voltage be U dc0, let the dc port voltage of the unipolar type collecting system m with the highest dc voltage be U dcm, the unipolar type collecting system includes a plurality of voltage source converters with ac ports connected in parallel, and active control of external dc port voltages U dc0 and U dcm is achieved through coordinated control of each voltage source converter in the unipolar type collecting system.
The alternating current sides of the converters in each unipolar collecting system can be controlled by adopting active-reactive balance control-based follow-up network, or can be controlled by adopting voltage-frequency-based networking, and the selection is specifically performed according to the system characteristics of the connected alternating current sides. If the alternating current side system connected with the unipolar collecting system is a strong power grid, the corresponding voltage source converter adopts a follow-up control mode; if the alternating-current side system connected with the unipolar collecting system is a weak power grid or a new energy system, the corresponding voltage source converter adopts a grid control mode.
The direct current sides of the converters in the unipolar collecting systems are controlled by master-slave control, direct current droop control or direct current voltage margin control, so that the direct current port voltage of the unipolar collecting systems is controlled. The current technology of master-slave control, direct current voltage droop control and direct current voltage margin control of the converter is mature, and no description is given here.
Referring to fig. 3, for any two unipolar type collecting systems x and y, let the dc voltage of the unipolar type collecting system with lower voltage be U dcx, and the number of connected submodules be N x; the direct current voltage of the monopole type collecting system with higher voltage is U dcy, and the number of connected submodules is N y;
The bypass duty cycle D of all sub-modules between two ports in each period T satisfies:
(1)
from formula (1):
(2)
Wherein Vc is the nominal value of the capacitor voltage in each half-bridge sub-module;
The capacitor voltage balance of each sub-module is ensured through sequencing voltage-sharing control, and the method can be as follows:
(3)
based on the formulas (2) and (3), D can be rewritten as:
(4)
meanwhile, with reference to the monopolar multiport HVDC sink system 0 (N x =0), then:
(5)。
The HVDC collecting method of the embodiment of the invention comprises the following steps:
Step S1, determining a lowest direct current voltage U dc0 and a highest direct current voltage U dcm;
S2, determining relevant parameters of each monopole type collecting system, each direct current inductor and each submodule, and determining the number of the submodules;
and S3, constructing a monopole type collection system, a direct current inductor and a submodule of the direct current voltage with the required magnitude in batches, and finally expanding the monopole type collection system into the HVDC collection system.
Hereinafter, the HVDC collection method will be described in more detail.
Assuming that four voltage class HVDC are involved in the planned system, 20kV, 160kV, 320kV and 800kV respectively, the four HVDC systems all need to be designed as unipolar systems.
Step S1, as can be seen from the above-mentioned plan, U dc0=20kV,Udcm =800 kV.
In step S2, according to engineering experience, at present, a commercial half-bridge submodule is usually constructed by using a 4.5kV IGBT, and the maximum withstand voltage of the half-bridge submodule is 2.5kV. Thus, the number of series sub-modules (without considering redundant sub-modules) between the 160kV HVDC system of the first stage and the 20kV HVDC system of the zeroth stage is (160-20)/2.5=56; the number of series sub-modules (without considering redundant sub-modules) between the 320kV HVDC system of the second stage and the 160kV HVDC system of the first stage is (320-160)/2.5=64; the number of series sub-modules (without considering redundant sub-modules) between the 800kV HVDC system of the third stage and the 320kV HVDC system of the second stage is (800-320)/2.5=192. Thus, the number of series connected sub-modules (without redundancy sub-modules) between the 800kV HVDC system of the third stage and the 20kV HVDC system of the zeroth stage is 56+64+192=312, i.e. the total number of sub-modules is 312 (without redundancy sub-modules). The four HVDC systems described above may employ the same 0.5mH dc inductor to ensure that the ripple current when the system is running meets the requirements.
And S3, respectively constructing a monopole type collection system, a direct current inductor and a half-bridge submodule with the required direct current voltage in four batches, and finally expanding the monopole type collection system into the HVDC collection system. For example, assuming that a 20kV HVDC system of stage 0 is initially built, only a monopolar multiport HVDC sink system 0 and a DC inductor L DC0 need be built. When a 160kV HVDC system of the first stage needs to be built, only a monopolar multiport HVDC sink system 1, a direct current inductor L DC1 and N 1 sub-modules, N 1 =56 (redundant sub-modules are not considered) need to be built. When a 320kV HVDC system of the second stage needs to be built, only the monopolar multiport HVDC sink system 2, the direct current inductors L DC2 and N 2 sub-modules, N 2 =64 (redundant sub-modules are not considered) need to be built. When the 800kV HVDC system of the second stage needs to be built, only the monopolar multiport HVDC sink system 3, the direct current inductors L DC3 and N 3 sub-modules, N 3 =192 (redundant sub-modules are not considered) need to be built. When a 2 nd 160KV system (assumed to be a fourth period) needs to be built, a submodule does not need to be built at the moment, and only the submodule needs to be connected to a direct current bus of the monopolar multiport HVDC collecting system 1 in parallel. Similarly, when a system of 320KV (assumed to be the fifth stage) of the 2 nd stage is to be built, no submodule is to be built, and only the direct current bus connected in parallel to the monopolar multiport HVDC sink system 2 is needed.
The embodiment of the invention also provides a computer device which comprises a processor and a storage medium, wherein the storage medium stores a computer program, and the computer program realizes the voltage control method of the HVDC collecting system when being executed by the processor.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when executed implements the voltage control method of the HVDC sink system described above.
While the invention has been described in terms of specific embodiments, it will be apparent to those skilled in the art that the invention is not limited to the specific embodiments described. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.
Claims (10)
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| CN118572765A (en) * | 2024-08-01 | 2024-08-30 | 国网浙江省电力有限公司电力科学研究院 | Energy modulator, energy port, energy port system and control method |
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